1. Lacking brilliance or vitality
   "a dull lacklustre life"
   - lackluster [US], lusterless [N. Amer], lustreless [Brit, Cdn] 
2. Lacking lustre or shine
   "staring with lacklustre eyes"
   - lackluster [US], lusterless [N. Amer], lustreless [Brit, Cdn]

See also: dull, hebetudinous

• weekend warrior
• weekender
• weeklong
• weekly
• weeknight
• ween
• weeness
• weenie
• weenie roast
• weensy
• weeny
• weep
• weeper
• weepie
• weepiness
• weeping
• weeping beech
• weeping love grass
• weeping spruce
• weeping tree broom
• weeping willow
• weepy
• weever
• weevil
• weevily